| 磁共振成像中刚体平移运动伪影校正 |
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| 引用本文： | 陈春晓,王世杰,陶华,罗立民.磁共振成像中刚体平移运动伪影校正[J].南京航空航天大学学报(英文版),2005,22(4):318-321. |
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| 作者姓名： | 陈春晓 王世杰 陶华 罗立民 |
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| 作者单位： | 1. 南京航空航天大学自动化学院,南京,210016,中国;东南大学生物医学工程系,南京,210096,中国
2. 东南大学生物医学工程系,南京,210096,中国 |
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| 摘 要： | 磁共振成像过程中，患者的轻微运动就会使扫描数据发生相位偏移，从而使重建图像含有运动伪影，降低成像的质量。严重的伪影会影响医生对病灶的精确定位。本文利用遗传算法高度并行、随机和自适应全局寻优的特点，提出了基于遗传算法的刚性平移运动伪影修正方法，逐次修正扫描信号在K空间中已偏移的相位。实验表明，基于遗传算法的修正方法，能有效校正扫描数据的相位偏移，达到抑制运动伪影的目的。
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| 关 键 词： | 磁共振成像 运动伪影 遗传算法 |
| 收稿时间： | 03 24 2005 12:00AM |
| 修稿时间： | 05 24 2005 12:00AM |
ARTIFACT CORRECTION OF RIGID TRANSLATIONAL MOTION IN MRI |
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| CHEN Chun-xiao,WANG Shi-jie,TAO Hua,LUO Li-ming.ARTIFACT CORRECTION OF RIGID TRANSLATIONAL MOTION IN MRI[J].Transactions of Nanjing University of Aeronautics & Astronautics,2005,22(4):318-321. |
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| Authors: | CHEN Chun-xiao WANG Shi-jie TAO Hua LUO Li-ming |
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| Institution: | 1. College of Automation Engineering, NUAA, 29 Yudao Street, Nanjing 210016, P. R. China; 2. Department of Biomedical Engineering, Southeast University, Nanjing, 210096, P. R. China |
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| Abstract: | During the process of magnetic resonance imaging (MRI), the patient motion causes phase errors in collected signals and induces motion artifacts in the reconstructed image. Severe artifacts interfere with the focus location. Because the genetic algorithm (GA) has characteristics of parallel, random and adaptive stochastic searching, a correction method of motion artifacts is presented based on the algorithm. The method can correct the phase error in K-space signals step by step. Experiments show that the motion artifacts in MRI can be effectively suppressed by using the method. |
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| Keywords: | magnetic resonance imaging motion artifact genetic algorithm |
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